A porn game that actually has gameplay, wow.
I do not rate smut games on their innovation- that's just not a factor in whether a piece of pornography is good or not. This is the game Papers, Please, repackaged as smut, and it works excellently for it. More adult games need to take entirely existing mechanical frameworks like this and throw their own coat of paint on top of it. It uses an engine capable of its genre instead of trying to force its gameplay loop down the throat of an engine barely capable of it, which is a decision rare enough in the porn game dev community that it deserves praise.
You're a veteran, fresh from a war. You've been restationed as a border guard, and in Papers Please fashion, conduct customs interviews with travelers who seek entry to your borders. As you successfully meet the criteria handed down by your superiors, you progress through the game. The criteria then becomes more complex, which complicates your process, in a nice little gameplay loop of escalating challenge.
The game can actually be played more or less without engaging in the smutty content, which makes the power fantasy more real for the player. This sort of situation is terrible in real life, but in an immersive fiction where none of the characters are real, the scenario is titillating. The optimization of the game and the random character generator works well, resulting in smooth gameplay with enough variety for its mechanics to remain fresh for how long you'd actually play it.
It also doesn't distract or get bogged down in stuff outside the Border Guard role, which also earns it points for focus. This allows for its core features to be refined, to work smoothly and without bugs, and to explore its ideas a bit more. You don't just have the option to strip down the travelers, or to violate them, but also to engage in corruption, selling their clothes for cash. You can do things like go through the whole violation deal, and still send them away. Stuff like that. The thrill of being evil, petty, corrupt and mean is something only games can explore safely, and this game knows what it's about.
It'd be nice if this scenario was only fantasy though, and wasn't a real world thing people go through. But, for this game, specifically, it's one of the better produced smut games out there, remaining focused, using an appropriate engine, and having a good aesthetic. If non-con domination/humiliation is up your alley, this game is a good way to explore that.